427 SBC & 4L80e build

[72K5CSTDarkOlive]

Short Block is assembled.. Now we are waiting for the heads to be built from AFR. We have to go directly through AFR because of the custom springs. They take 3 weeks for them to build. Strange that they don't have a set sitting on the shelf, especially for SBC.

[nautique1228]

Looking good, contemplating a similar build for my 58. 408 Stroker LS, with ls3 heads and edelbrock super victor intake. Are you planning on staying all motor? What power level or E.T you looking for?

[jjzepplin]

WOW! Them parts are purdy! I'm In.

[72K5CSTDarkOlive]

Originally Posted by nautique1228

Looking good, contemplating a similar build for my 58. 408 Stroker LS, with ls3 heads and edelbrock super victor intake. Are you planning on staying all motor? What power level or E.T you looking for?

Yes, for now. Shooting for 600+hp and 575+ TQ. The custom solid roller my engine builder is using should easily exceed this. We actually might have to tune it down a bit. The Holley sniper I am using is rated up to 650 HP.

[nautique1228]

Solid roller! That’ll be a bad sob!
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[YoungPup1977]

All them engine parts for that there horsepower. Can’t wait to see how the trans is going to be built to withstand all that power and how you plan on putting all that power to the wheels.
How about some pics of the parts installed into the trans and how the trans was upgraded to withstand 650 HP thru the NP205.
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[72K5CSTDarkOlive]

Originally Posted by YoungPup1977

All them engine parts for that there horsepower. Can’t wait to see how the trans is going to be built to withstand all that power and how you plan on putting all that power to the wheels.
How about some pics of the parts installed into the trans and how the trans was upgraded to withstand 650 HP thru the NP205.
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I specifically told the guy who was building the trans and Tcase to only handle 400 lbs of torque.. Dude, go troll somewhere else.

[72K5CSTDarkOlive]

Originally Posted by nautique1228

Looking good, contemplating a similar build for my 58. 408 Stroker LS, with ls3 heads and edelbrock super victor intake. Are you planning on staying all motor? What power level or E.T you looking for?

Check out this 408LS that they are building right now too.

[YoungPup1977]

Originally Posted by 72K5CSTDarkOlive

I specifically told the guy who was building the trans and Tcase to only handle 400 lbs of torque.. Dude, go troll somewhere else.

Ok. I’m gone

[Rickysnickers]

I don't think he was trolling you. It sounded like a legit question to me.

[72K5CSTDarkOlive]

Originally Posted by YoungPup1977

Calling me a troll ? WTH....the thread name includes a 4l80e build too. Just wanting to see pics of the trans build. Oh I see you are only a check writer.... sorry DUDE my bad............
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Originally Posted by Rickysnickers

I don't think he was trolling you. It sounded like a legit question to me.

It was a legit question but I felt it was asked in a condescending manner. At least thats how I interpreted it, but maybe that wasn't your intentions so my bad.

I'm more than happy to answer questions and or provide detailed pics. I''ll be getting some pics and part #'s used next week and will post that once I do.

In the meantime, i'll try to answer your question. I sourced a 4l80e from a 2005 3/4 ton Yukon for 200 bucks. I took it to the guys shop who was going to build it for me to be able to handle the added power as well as go through the TCASE.

I know one thing we had to do was upgrade the input shaft from the 27 spline out of the Tcase to a 32 spline as well as an adapter plate. The internal shaft in the transmission he used is rated for up to 800 lbs of torque which I think it was a billet shaft, but I'll find out for sure soon.

For the torque converter I went with FTI's 3200 stall triple disk billet so the tuner can make adjustments to lock up sooner if need be.

As for writing checks.. Yes, for 400 bucks in labor I had an expert go through the transmission and use parts that would need to be upgraded. There was also machine work that needed done in both the tcase and trans ( more on that once I get the details) and for one, I don't own that kind of machinery to do that kind of work. For me, the 400 bucks in labor was worth it and I can go to sleep at night knowing it was built right and he will stand up to his work in case something happens.

Where I save money is doing the install and relocation of the Trans/Tcase myself. Having a shop do that would cost me more for this part than the actually rebuild. There are certain things that are far beyond my knowledge or expertise so I will outsource that, but I try to do as much on my own as I can or at least attempt.

[kwmech]

Any updates on this build?

[72K5CSTDarkOlive]

Originally Posted by kwmech

Any updates on this build?

We did the dyno last Monday and I took a couple days off from work to help with the install this last week. Hoping to finish all the electrical tomorrow and turn it over.

I wish I took more pics but I was just so caught up in trying to get the install done as quickly as we could. What we thought would take one day has turned into 3 days.

If you have an Instagram account you can click this link and here it run on the dyno. https://www.instagram.com/p/BnAOhzvB...y=gromm.racing

I was pretty happy with the TQ curve. It had 500 LBS at 3500 and carried it all the way through 6400 RPM's and peak TQ was 568 @ 4800

[TexasT]

Originally Posted by 72K5CSTDarkOlive

With the big cam I'm going to have to convert to hydroboost. Got a set of brackets for the hydroboost from CaptainFab. The hydro unit came from Power Brake Exchange here in San Jose. pwrbrake.com

This particular unit came off a 90's P30 Chevy Step Van. For the MC I needed to step up to a 1 1/8" bore. Everything looks to line up perfectly.

What made it need to a 1.125" bore on the mc? Rear Disk upgrade? I love the hydroboost set up. I think they work great on my stuff, though I just used stock stuff on mine.


That bare block is SEXXY!

I'd like to know the particulars of the 4l80e build also. Did the tc just require a new 32 spline input? I know that is what I did to the np246 I put together for our Burb when the pump rub took out the original.

Great build! Keep On Keeping on. My neighbors would be having a coronary if I had our truck on stands for more then an afternoon.

Looks like they dynoed with a carb? Timing stated to be 40*. Is this locked there or are you running a dist with vac advance and mech advance or one? I'm no guru but the bsfc looks low and the engine might could use some tuning to get more out of it. Either way it DEFINATELY makes PAH! Will they be making any pulls with your fuelie setup?

Originally Posted by DeadheadNM

Too cool! Did you have to update any of the parking brake cables for use with the rear disc brakes? What happened with the OEM fuel tank - available?

I think this guy wants to acquire your original tank.

[Rickysnickers]

It appears he used a Sniper EFI unit for his engine.

[TexasT]

I don't see very well and this pic is pretty blurry, but that looks like a holley carb to me.

[RedRider]

Great progress
, I’m interested in the 4l80e build as well. Think you’ll modify your converter stall after seeing those dyno numbers?

[Captainfab]

Yeah, looks like a Holley carb to me too while on the dyno.

Originally Posted by TexasT

I don't see very well and this pic is pretty blurry, but that looks like a holley carb to me.

[Rickysnickers]

Yep, I didn't notice that one. I focused on the picture where the engine was installed in the truck.

[Chevyrestorerman]

Sniper investigation. Ongoing...
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[72K5CSTDarkOlive]

[QUOTE=TexasT;8336265]What made it need to a 1.125" bore on the mc? Rear Disk upgrade? I love the hydroboost set up. I think they work great on my stuff, though I just used stock stuff on mine.

I was told that the bigger bore would give it more pedal travel but less pedal effort and I also think too because I'm doing disc/disc. It was a recommendation from the place I got the Hydro unit from.


That bare block is SEXXY!

I'd like to know the particulars of the 4l80e build also. Did the tc just require a new 32 spline input? I know that is what I did to the np246 I put together for our Burb when the pump rub took out the original.

Great build! Keep On Keeping on. My neighbors would be having a coronary if I had our truck on stands for more then an afternoon.

Thank you! Luckily, I was able to get the trans/tcase installed that same day. I went to Harbor Freight and picked up a transmission jack to do the install. I put it back in the box very neatly like no one ever used it and returned it that same day.

I'm waiting for the guy who built my trans/tcase to get back into town. He's been out of the country for a few weeks. I'll make sure to get all the details that went into the build and update this thread when I do.

Looks like they dynoed with a carb? Timing stated to be 40*. Is this locked there or are you running a dist with vac advance and mech advance or one? I'm no guru but the bsfc looks low and the engine might could use some tuning to get more out of it. Either way it DEFINATELY makes PAH! Will they be making any pulls with your fuelie setup?

We had to use a carb because we didn't have an EFI pump that would have been sufficient enough to use at the dyno. The distributor is mechanical advanced only and is not locked out. It comes into total timing around 2800 rpm and when the dyno is testing (starts at 3500 rpm) it's already fully advanced.

My engine builder thinks we could get more out of too because it was running a little more on the rich side and if he had some more time he could have leaned it out a bit. The Cam has 4 degrees advanced built into it to help with the bottom end so if we didn't advance the cam we definitely could have picked up more on the top end but I'd rarely ever take advantage of using that power at 6500+ rpms.

A chassis dyno might be in the foreseeable future!

[72K5CSTDarkOlive]

Originally Posted by RedRider

Great progress
, I’m interested in the 4l80e build as well. Think you’ll modify your converter stall after seeing those dyno numbers?

Thanks RedRider. I think the 3200 stall is going to work out perfect and won't need to make any adjustments. I promise to get the details on the 4L80e build. Just waiting on my mechanic to get back in town. I'll post an update as soon as he gets back to me with the details.

[Chevyrestorerman]

Any idea of what the numbers would of been with the Sniper EFI ?

[TexasT]

Originally Posted by 72K5CSTDarkOlive

A chassis dyno might be in the foreseeable future!

I am JELLY! This is an aweso build all that is missing is ME! haha

Either way keep up the great work as it is going real well.
A suggestion or two. and you will have to fool with it(AKA:tune) is the 40* timing seems like a lot but different engines like different amounts. I would get a vac advance on there to help with mileage. and would try some lighter springs to get the mech in sooner. again this is tuning so it takes some time and effort to get it "ALL" out.

Might try some different fuel pressure settings(UP and Down). Just have to monitor the knock and stay out of it. Keep it fat(RICH) and you should be fine. and sneak up in leaning it out for power.

Looking forward to you getting it on the street. Great work.

[Chevyrestorerman]

How is that engine performing with the EFI, I am wanting to install a EFI sniper on my big block in my 72 blazer.